Factful math: Grade 4th-6th
Math skills: Percentage / Circle graph
Related issues: Energy
The total number of BEV (Battery electric vehicle) sold in 2021 was 5 million in the world. How many BEVs were sold in the United States in 2021?
A. 4.5 thousand
B. 45 thousand
C. 450 thousand
NSWER C
5 x 0.09 = 0.45 (million) = 450 (thousand)
Source: IEA, https://www.iea.org/reports/electric-vehicles
Factful math: Grade 4th-6th
Math skills: Multiplication
Related Environmental issues: renewable energy
The world’s largest offshore wind farm Hornsea 2 in the UK has 165 wind turbines.
A single rotation of a wind turbine takes 6 seconds and generates energy to power a home for a day. How many homes can the Hornsea 2 wind farm power in an hour of operation?
ANSWER 3
1 hours = 3600 seconds
A wind turbine rotates [3600/6=600] times in an hour.
A wind turbine generates energy to power 600 homes in an hour.
There are 165 wind turbines in the Hornsea 2 wind farm, so the wind farm can generate energy to power [600 x 165 = 99,000] homes in an hour.
Source: BBC. Hornsea 2: North Sea wind farm claims title of world’s largest [https://www.bbc.com/news/science-environment-62731923].
